1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
# -*- indent-tabs-mode: t -*-
# Soya 3D tutorial
# Copyright (C) 2001-2004 Jean-Baptiste LAMY
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# basic-2: Time management : a rotating 3D model
# This lesson is the same as basic-1.py, except that the model rotates.
# You'll learn about time management and rotation.
# Basic Soya's rotation functions are :
#
# rotate_x : rotates around the X axis
# rotate_y : rotates around the Y axis (=in the horizontal plane)
# rotate_z : rotates around the Z axis
# Imports and inits Soya (see lesson basic-1.py).
import sys, os, os.path, soya
soya.init()
soya.path.append(os.path.join(os.path.dirname(sys.argv[0]), "data"))
# Creates the scene.
scene = soya.World()
# Loads the sword model.
sword_model = soya.Model.get("sword")
# Create a class of rotating body. Soya if fully Object Oriented, and almost all
# Soya classes can be extended.
# Here, our class inherits from soya.Body, and so can display a model.
class RotatingBody(soya.Body):
# The MainLoop calls repeatedly the advance_time method, for all object in the scene.
# To make the body rotate, we just have to override this method.
# In Soya, the time unit is the "round" ; one round is 30 milliseconds (default value).
# The proportion argument of advance_time is the proportion of a round that has occured:
# e.g. 0.3 means that 30% of a round has occured since last call, i.e. 9 milliseconds.
# advance_time should be limited to animation code, and not decision code. We'll see
# another method for decision stuff in basic-3.py.
def advance_time(self, proportion):
# Calls the super implementation of advance_time. This IS NEEDED, as some Soya object
# already have an advance_time method.
soya.Body.advance_time(self, proportion)
# Rotates the object around Y axis. The angle is proportional to proportion because
# the more time has been spent, the more we want to rotate, in order to achieve a
# smooth animation.
# Almost every rotations or moves that occurs in advance_time should be proportional
# to proportion.
self.rotate_y(proportion * 5.0)
# Creates a rotating body in the scene, using the sword model.
sword = RotatingBody(scene, sword_model)
# Creates a light.
light = soya.Light(scene)
light.set_xyz(0.5, 0.0, 2.0)
# Creates a camera.
camera = soya.Camera(scene)
camera.z = 3.0
soya.set_root_widget(camera)
soya.MainLoop(scene).main_loop()
|
